Image captionRelatives and local people surrounded police cars
Unofficial death estimates in the media range from 60 to 78.
Venezuela’s prisons are notoriously overcrowded and are known to be filled with weapons, drugs and gangs.
The country has struggled to accommodate its prisoners amidst an ongoing economic crisis, leading to convicts being held at temporary facilities such as the one in Valencia.
Carlos Nieto, head of the association Una Ventana a la Libertad (A Window on Freedom), says some police facilities are overfilled at five times their capacity.